Pull-socket.



W. SL'ABY. PULL SOCKET. APPLICATION FILED APE. 2'4, 1909.

Patented May w,v 19w.

YINVENT'OR ATTORNEYS [UNI D STATES Paris's cri ics.

FRANK w. SLADY, or BRIDGEPQRT, CONNECTICUT, nests-nos TO THE BRYANT saneTRIS COMPANY, or samosroar, connscrronr, a CORPORATION or coimsc'rrcurPULL-SOCKET.

To all whom it may concern:

Be it known that I, FRANK V. Smnr, a citizen of the United States ofAmerica, and residing at Bridgeport, in the county of Fairfield andStateof Connecticut, have invented a certain new and useful Improveinent inPull-Sockets, of which the tollowinglis a specification. vx ymventiomrelates to pull sockets for incandescent lamps and moreparticularly to certain details 0t construction hereafter re'- ferredto, the. object of my invention being toprovide an improvedconstructioni such details; r

In the accompanying drawings, Figure l '-is a side elevationpartlyin'section oi, said socket; Fig. Q'is a Inn of the same with thetop button remove Fig. 8 is a perspective of the spring tensioningdevice, parts detached and drawn to a larger scale; F 4

' is asimilar View of the same partially broken away, with the partsassembled; Fig. 5 is a similar view of the chain carrier parts; and Fig.6 is a. similar view of the rotary switch member and its carrierdctached; Fig. T'i's a side elevation of the socket drawn to a smallerscale; Fig. 8 is a longitudinal section; and Fig. 9 is a partial plan ofa chain carrier of modified form.

The socket illustrated is of the type shown in the Platt Patent 716,578and in the copending application Goodridge 467,619, and comprises upperand lower msulating buttons A and spaced apart by standards a,

I) aud o, of which the first two serve as binding posts, while the lastmentioned carries the chain guide and the tensioning device for theratchet spring as will be more fully described hereafter. The leadinginwires may be secured to the standards a and b by means of the bindingscrews m and n and the lamp circuit completed through the-spring contacta; on the standard a cooporating with the rotary switch piece S to bemore fully described. The latter operated by means ofa chain (3 which,assing through the chain giliide 10,- is secure to the actuating ratchetmember 11 through the chain carrier 1.? fast thereon.

It has been fiound that the rotary switch member of the type generallyin. use in switches of this character is notwholly satisfactory, since,in the course of time the Specification of Letters Patent. PatggnfigdE13, 1'? 1910,

Application filed April 24, 1909. Serial No. 492,916.

parting edges of the two contact members the rotary switch piece S, thebody of which is of insulating material as is customary, with a cu rrentcarrying band 5, the contact Wings 8 of which are of spring metal andare formed so as to normally spring out from the teeth 8 above whichthey lie;

Upon one movement of the ratchet, the piece [S is partially rotated. thecoiuact wing s is pressed against the tooth s by the spring contact a:and the lamp circuit is completed. As the piece S is again partiallyrotated by the ratchet and the contact reaches the end of the tooth s,the contact wing s is freed. and, flies outward while the spring contact:12 drops inward to the base of the tooth. The contact is thus not onlysharply broken, but the distance between the current carrying members isabout twice that usually obtained.

The danger of arcing through accuinulation of dust is minimized bytheinsulating air space which separates the contact wing s from the tooth-8 on the switch piece S.

will benoted that iii bending up the wings .9 into position over thecircumferential teeth s on the switch piece S, a preliunnary bend in theopposite direction isimparted' at 0 so that the angle of curvature neednot be made so sharp as heretofore customary. This materially lessensthe percentage of breakage now incidental to the usual inethodj member13, socketed on the end of the switch spindle and provided with dowir Asan improved detail of manufacture it" 'wardly extending lugsfll iagainst any one or more of which the up rend of the actuatin spring 15abuts. slot 16 in the head of t e abutmentmember affords means forrotating the same by a screw diiverfor instance. A friction bearing 17for'the member 13, suihcient. to hold the latter in any position towhich it may" be adjusted, is afforded by means of an arm 18 of s rinmetal referably integral with the sta'ndar sai arm being sp adordsadditional frictional surface. The member 13, which is of greaterdiameter than the normal diameter of the bearing, is inserted byspreading the split ends of the arm 18. CollarsQOand 21 above and belowthe bearing prevent the abutment'member 13 from: being pushed out of itsbearing in either direction the collar 20 bein formed after the partshave been assemble An improved constructionofthe ratchet and chain railis also shown. Heretofore it has been customary to form the chain raileither integral with the ratchet as described in the Platt patent abovementioned, or in two pieces joined together'at right angles andsubsequently united to the ratchet member. The latter is the prevailingmethod since it has been found practically impossible to manufacture theparts from a single blank, the percentage of breakageand imperfectpieces being too l'iigh. I have found however that the chain rail proper22 may be 'formed from a. single blank, by suitably rolling the same. Ifthe blank be provided with lugs and corresponding perform 'tions 24% beformed in the wing 25 of the ratchet 11, the rail may be'readilyattached by merely passing the lugs 23 therethrough and spreading theirends. This is quite a saving over the three-piece process, since but twoblanks are formed for both ratchet and chain rail and the rolling of thelatter into desired. form is extremely simple. An-

-othcr improvement in the chain rail is shown in Figs-8 and i) andcomprises a modification of the common claw .12 shown in. Fig. 5. Bysubstituting for the latter a tongue 1-2 perforated and slotted zit-12to permit the insertion of a chain ball and bending the endoi the tonguearound beneath the slot I prevent the insertion of more than theterminal ball of the chain;

This eliminates the podsible danger of a dangling chain end within theinterior of the socket. 3

To prevent the possibility of the chain carrier jumping out of therunway 28 in which its lu 26 works and causing a short circuit by comingin"contact with the-terminal a. I provide a shoulder 27 on the upperinsulating button which extends downward .a suiiicient distance todepress the chain carrier and bring the lug26 back into the runway 28 incase it should have been lifted out through any accident.

It will be readily understood that the'preit at the bearing end. andprovided with a split collar 19 Whichemcee be varied without departingfrom mv 1nvention and I do not limit myself to the details as shown. I

I claim as my invention:

'1. In an electric switch mechanism, a ratchet member, a spring tendingto turn the same in one direction, and a tensioning device for saidspring,.comprising an abut ment memberengaged by one end of said springand a frictional collar forming a bearing for said abutment piece andholding the latter in any position to which it may be adjusted by merelyrotating the same.

2. In an electric switch" mechanism, a ratchet member,' a spring tendingto turn thesame inone direction,-' and a tcnsioning device for saidspring, comprising an abutment member engaged by'one-end oi. said springand asplit frictional collar forming a bearing forsaid abutment pieceand holding the latter in any position to which it may beadjusted bymerely rotating the same.

3. In an electric switch mechanism, a ratchet memberfa spring tending toturn the samein one direction, and a tensioining device for said spring,comprising an abutinent member engaged by one end oi said spring and africtional collar forming a bearing for said abutment piece, saidabutment being ofi'set above and below said collar to prevent axialdisplacement. 4. In 'a pull socketea stationary spring terminal and acoiiperating rotary switch member comprising a non-copductlng body andconducting spring contact wings rotating therewith.

5. In a pull socket a stationary spring terminal and a rotary switchmember 00- operating therewith, said' switch member comprising anon-conducting body with circumferential teeth'formed therein and conducting spring wings lying circuinferentially above certain of saidteeth and substantially co-terminous therewith.

(3. In an electric switch, a rotary switch member comprisinganon-conducting body provided with circumferential teeth and a'condmiting member movable therewith, the

latter forming a plate lyihg against a face ol said. body with wingsangled over certain of said circuin'ferential teeth, the said wingsbeing curved away from and then toward said body piece whereby a. curveof relatively great radius is smurcd at the junction of said wings withsaid body piece, substan tialiy as described. I

7. In an electric switch, a rotaryswitch member comprising anon'conducting body -provided with circumferentialL teeth and aconducting member carried thereby, the latter forming a platelyingagainst ,a face of said-body withcontact wings at right anglesthereto rounded over certain of said circum-- ceases between saidbuttons, a ratchet member to actuatethe same, a. stop in coimectionvnththe lower button to limit the angular movement of said. ratchet and ashoulder on said upper'button to depress said ratchet against -saidstop, substantially'as described.

9. In a pull socket, a pair of insulatin buttons, a rotary switch memberarrange between said buttons, a ratchet member to actuate the same, asto in connection with 15 the lower button to limit the angular movementof said ratchetand means carried by the upper button to insure theoperation'of said stop.

10. In a pull socket, a chain rail having. 20 means for securing thechain thereto and means in connection therewith-for limiting the lengthof the chain within the socket,

substantially as described.

11. In a pull socket, a chain rail having means for securing a chainthereto and a tongue arranged with relation to said securmg means tolimit the extent of chaln extending into said socket beyond saidsecuring means.

12. in a pull socket, a chain rail having a channel for the body of thechain and an oii'set end slotted to receive and retain a ball of thechain together with a tongue arranged to prevent the insertion of morethan a predetermined length of chain through said slot.

13. In a pull socket, a pair of insulating buttons, a switch operatingratchet arranged between said buttons and provided with a stop lug, oneof said buttons-being provided with an offset runway in which said lugworks, whereby the extent of oscillation of said ratchet is limited, andthe other button being provided with a shoulder over said the accidentalrise of said

